Piston for high-pressure compressors and the like



W. PROFITLICH Plswofi FOR HIGH PREssUiw COMPRESSORS AND THE LIKE FiledAfigust 22, 1924 Wow W WW T j strong pressure resiliency therefore theUNITED STA wunnmr raorrrmcn,

WERE! AKTIENGESEQLSCEAFT,

"Tits Oi KIEL, GERMANY, ASSIGNOB IO FRIED. KRUPP GERMANIA- OF.KIEL-GLABDEN, GERMANY.

j' rrsron i on men-rnussuan cournnssoas nnnrnn rxn.

Application filed August 22, 1924. Serial No. 733,833.

To all whom it may concern:

Be it known that I, WILHELM residing at Kiel, Germany, German Republic,

Pnorrrucrr, a cltlzen of the have invented a certain new and usefulImprovement in Pistons for High-Pressure Compressors and the like, ofwhich the followin is a specification.

-..It has been found t of the cylinder and, more particularly,

guide faces of the piston pressure compressors are abnormally high wear.

at the working faces the rings of highsubjected to an This phenomenon isbased on the fact that the highly compressed air enters behind thepiston rings and presses the of the cylinder.

same at an unnecessarily against the working face The leakage of thecompressed air takes lace at the joints (locks) of-the ordinary e asticpiston rings as well comparatively small thickness in as at the entlrecircumference of .the rings.

is facilitated inasave to be made of a radial direction for giving themthe required the rings bear a head [surfaces of ainst the piston bodyonly by narrow annu ar faces and the width of t ese bearlng facesbecomes even more unfavorable during the springing and radial of thering. In addition thereto,

shiftin the sai annular faces will wear out' rapidly becausethey are sosmall, and in consequence thereof there will" gradually be produced atboth sides of the piston rin which in turn will render the Te more easy.Now, the

compressed air the.

va clearance akage of the invention has for its object to provide aiston for high-pressure compressors and the ike which does no longerpossess the said drawbackof'a too rapid wearof the contactin surfaces ofthe piston rings and cylinder, this object being essentially attained byarranging ahead of the ordinary divided elastic plston rings towards thecompression space 'a plurality of undivided piston rings.

The accompanying drawing illustrates,

as anembodiment of the subject-matter of the invention, an

elevation, partly in section,

of a piston constructed in accordance with the invention for ahigh-pressure compressor.

A designates the diagrammatically indieated cylinder and B the piston ofa high- PIGSSUI'B compressor.

The piston body B has slipped onto its upper portion which is ofi'set ina step-like manner,

rings C of anguor inary e lar cross-section, andinserted between eachtwo of these rings C is a piston ring E or F, respectively. The wholesystem of rings C, E, F is held in positionlby 'a mushroomshaped headmember D which is screwed into the piston body B. i The rings F areordinar elastic piston rings, while the rings E whic lie ahead of therings F, are solid rings which are thicker in radial direction than therings F'and have a radial play in the piston body. 1 T e arrangement ofthe undivided piston rings E ahead of the divided elastic rings Fsecures the followizl advantages: First, the rings 1 have no joint whichusually facilitates most the entering of the compressed air behind thepiston rings. Besides, as the rings'need notbe resilient theirvthickness in radial direction may be made so large as to provide forsufliciently large packing faces between the head faces of the rings andthe piston body, whereby at the same time the wear of those head Finallthe solid construction of thepiston rings prevents the same from beingtoo strongly pressed against the working surface of the cylinder and,consequently, a too heavy wear of the guide faces is avoided even ifsome compressed air would enter behind the piston rings E. As a matterof course, the piston rings E must be particularly wellfitted and groundin the cylinder. During the working, wear of which is kept within normallimits for the above-stated reasons, act like a lab rinth acking as aprotection for the astic piston rings F which are now under a compressedair pressure which is considerably smaller than the full pressure ofcompression.

tion will be recommendable 111 all cases where the piston has to workagainst. high pressures, such as for lnstance also in high- Therefore,even if compressed air should enter behind the elastic pressurecombustion engines, high-pressure piston steam engines and the like.

The number of the solid rings depends on the amount of the finalcompression pressure.

to be used Claims. divided elastic piston rings and undivided 1. In a,piston for high-pressure compiston rings arranged ahead of and being 10pressors or the like, a divided elastic piston thicker in radialdirection than the divided ring, and aplurality of spaced, undividedelastic rings. 5 piston rings in advance of said divided ring Theforegoing specification signed at and forming a labyrinthine packing forpro- Hamburg, Germany, this 29th day of July, tecting the latter. 1924.

2. A piston of the kind stated, comprising WILHELM PRO FITLICH;

